Mud guard for submarine drills



C. C.. HANSEN MUD GUARD FOR SUBMARINE DRILLS Nov. 20, 1928. 1,692,440

Filed Oct. 6. 1927 INVENTOR.

H15 ATTOR EY Patented Nov. 20, 1928.

UNITEDSTATES.

PATENT FFFICE.

CHARLES G. HANSEN, 0F EAS'ION,'EENNSYLVANIA, ASSIGNOR 1T0 INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPGRATION OF NEW JERSEY.

Mun GUARD, FOLR- snnivrnnrnnf DBILLS.

. Application filed October 6, 1927. Serial No. 224393.

This invention relates to submarine drills, but more particularly to submarine hammer drills of the type disclosed in my Patents No. 1,610,372, granted December 14, 1926, and No.-1,6 l5,989, granted October 18, 1927. 1

The tubular mud guard shown in connection with such submarine hammer drill units and adjustably supported the lower end of the guide frame, whichframe may take the form. of a spud resting on the bottom, is liable to work loose or may be raised out of position when the drill steel is drawn out of the mud guard. In order to prevent this action and maintain the mud guard firmly in position down upon the rock under all circumstances, elastic means are provided in accordance with this invention for holding the mud guard downwardly. For this purpose springs may be connected to the lower end of the guide frame and to the upper or intermediate portions of the mud guard, so that any tendency of the mud guardto move upwardly is resisted by the springs.

In the drawings showing a preferred form ofthe invention,

Figure 1 is an end elevation, partly in vertical section and partly. broken away, of a barge and drilling unit showing the mud guard,

Figure 2 is an enlarged detail view of the mud guard, partly in vertical section broken away, and

F gure 3 1s a transverse section of Figure 2 on the line 33 looking in the direction of the arrows.

Referring to the drawings, a barge A is shown partly broken away and the main frame B of the drilling unit is provided with the guides C in which the guide frame or spud D is guided. The foot piece E of the spud is adapted to rest upon the bottom and carries the mud guard F which extends slidably through a bore E in the foot piece E. The submarine hammer drillG is carried by the drilling frame H which is guided on the guides .T mounted on the spud. The hollow drill steel K is adapted to extend through the mud guard F and the weight of the rock drill and drilling frame may be applied to the mud guard for forcing the mud guard through silt and loose material overlying the rock intended to be drilled.

A motor L having the drum 0 operates the cablev 1? for raising and lowering the spud and a separate motor Q and cableR may be 1 provided for the drilling frame. 7 I In order to maintain the mud guard Fm position and prevent it from being dislodged or moved upwardly during the changing of drill steels, elastic connections are provided between the spud and the mud guard. These connections may take the form of coiled tension springs S suitably connected to the shoe E and to the upper portion of the mud guard F so that any tendency to pull the mud guard up or dislodge it is resisted by the springs S.

I In practice, after the barge has been located in the desired position .with respect to .the work, the guide frame D, together with the mudguard F, may be lowered. The weightof the guide frame will press the foot pieceE and the mud guard F into the loose material overlying the rock intended to be drilled. Additional pressure may be applied to the mud guard for this purpose by permitting the weight of the rock drill to rest thereon. After the mud guard rests upon the rock to be drilled, the guide frame D may be lowered a sufficient distanceto set up a tension in the springs S as illustrated in Figure 1. The tension thus induced in the springs S will exert a constant pull. on the 1 mud guard in a downwardly direction so that wlien'it is desired to remove a drill steel from s the drill hole the same may be readily accomplished without disturbing the position of the mud guard.

I claim:

1. A submarine drill unit, having a main frame provided with guides, a guide frame vertically movable on said guides, a drilling element, a tubular, mud guard slidably "supported atthe lower end of said guide frame below the drilling element whereby the weight of the drilling element may rest upon the mud guard to force it down to the rock to be drilled, and an elastic connection between the guide frame and themud guard constantly tending to force themud guard downwardly.

2. A. submarine drill unit, having a main frame provided with guides, a guide frame vertically movable. on said guides, a drilling element, a tubular mud guard slidably supported at the lower end of said guide frame below the drilling element whereby the weight of the drilling element may rest upon the mud guard to force it down to the rock ing element, a tubular mud guard slidably supported at the lower end 9f said guide 1 frame below the drilling element whereby the 10 Weight of the drilling element may rest upon the mud guard to force it down to the rock to be drilled, and tension springs cenneetingthe mud guard and guide frame for forcing the mud guard downwardly;

ln testiniony whereof I have signed this specification.

CHARLES C. HANSEN. 

